1) The average of 2, 7, 6 and x is 5 and the average of 18, 1, 6, x and y is 10. What is the value of y ? A) 5 B) 10 C) 20 D) 30 Answer: Option CExplanation:we have : 2+7+6+x4=5 15+x= 20x=5 Also 18+1+6+x+y5=1025+5+y=50y=20